Ultimate ASP.NET 5 Web API Development Guide - Refactor POST Method with Data Transfer Object

The video tutorial explains the concept of Data Transfer Objects (DTOs) and their role in API design. It highlights the issue of overposting, where unnecessary data is sent through API endpoints, and how DTOs can prevent this by specifying only the required fields. The tutorial demonstrates creating a DTO for a 'Country' object, implementing it in a controller, and testing it using tools like Postman. It also covers adding validations to DTOs and discusses the importance of following the Single Responsibility Principle. The video concludes with a brief introduction to AutoMapper for data type conversion.

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